GPS Disciplined Frequency Standard

GPSDO testing

Modifications and updates for the GPSDO described in Homebrew, Radcom March 2008.

This is the support page for the GPSDO described in the RSGB magazine RadCom for March 2008.
As this has become one of those never-ending projects, I have decided to start a web-page
dedicated to this project and GPSDOs in general.

The original 10MHz crystal oscillator has been replaced by a NDK NAC3015A OCXO. Most OCXOs have
a frequency control input. A DC voltage applied to this input can be used to adjust the output
frequency of the OCXO over a small frequency range. The control range is typically just +/-
a few Hz, and rarely more than +/- a few tens of Hz.